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WARNING: Version 0.90 of Elasticsearch has passed its EOL date.
This documentation is no longer being maintained and may be removed. If you are running this version, we strongly advise you to upgrade. For the latest information, see the current release documentation.
Edge NGram Tokenizer
editEdge NGram Tokenizer
editA tokenizer of type edgeNGram
.
This tokenizer is very similar to nGram
but only keeps n-grams which
start at the beginning of a token.
The following are settings that can be set for a edgeNGram
tokenizer
type:
Setting | Description | Default value |
---|---|---|
|
Minimum size in codepoints of a single n-gram |
|
|
Maximum size in codepoints of a single n-gram |
|
|
(Since |
|
token_chars
accepts the following character classes:
|
for example |
|
for example |
|
for example |
|
for example |
|
for example |
Example
editcurl -XPUT 'localhost:9200/test' -d ' { "settings" : { "analysis" : { "analyzer" : { "my_edge_ngram_analyzer" : { "tokenizer" : "my_edge_ngram_tokenizer" } }, "tokenizer" : { "my_edge_ngram_tokenizer" : { "type" : "edgeNGram", "min_gram" : "2", "max_gram" : "5", "token_chars": [ "letter", "digit" ] } } } } }' curl 'localhost:9200/test/_analyze?pretty=1&analyzer=my_edge_ngram_analyzer' -d 'FC Schalke 04' # FC, Sc, Sch, Scha, Schal, 04
side
deprecated
editThere used to be a side
parameter up to 0.90.1
but it is now deprecated. In
order to emulate the behavior of "side" : "BACK"
a
reverse
token filter should be used together
with the edgeNGram
token filter. The
edgeNGram
filter must be enclosed in reverse
filters like this:
"filter" : ["reverse", "edgeNGram", "reverse"]
which essentially reverses the token, builds front EdgeNGrams
and reverses
the ngram again. This has the same effect as the previous "side" : "BACK"
setting.
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